﻿#region Copyright
//       Copyright (c) 2009 - Antoine Jaussoin - http://www.jaussoin.com/blog/
// 
//        This program is free software: you can redistribute it and/or modify
//        it under the terms of the GNU General Public License as published by
//        the Free Software Foundation, either version 3 of the License, or
//        (at your option) any later version.
// 
//        This program is distributed in the hope that it will be useful,
//        but WITHOUT ANY WARRANTY; without even the implied warranty of
//        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//        GNU General Public License for more details.
// 
//        You should have received a copy of the GNU General Public License
//        along with this program.  If not, see <http://www.gnu.org/licenses/>.
#endregion
using System;

namespace FT.Architecture.Utils.Math
{
    /// <summary>
    /// Provides helper for generating random numbers
    /// </summary>
    public class RandomFactory
    {
        private static Random _randomGenerator;
        private static readonly object Lock = new object();
        
        /// <summary>
        /// Returns a Random object instance, as a singleton. 
        /// This ensures that the Random is only initialised once, 
        /// which should avoid getting the same results twice.
        /// This is Thread Safe.
        /// </summary>
        public static Random Instance
        {
            get
            {
                //Double locking
                if (_randomGenerator == null)
                {
                    lock (Lock)
                    {
                        if (_randomGenerator == null)
                        {
                            _randomGenerator = new Random(DateTime.Now.Ticks.GetHashCode());
                        }
                    }
                }

                return _randomGenerator;
            }
        }
    }
}
